At the Defense Intelligence Agency, Lang was the Defense Intelligence Officer (DIO) for the Middle East, South Asia and counter-terrorism, and later, the first Director of the Defense Humint Service. At the DIA, he was a member of the Defense Senior Executive Service. He participated in the drafting of National Intelligence Estimates. From 1992 to 1994, all the U.S. military attachés worldwide reported to him. During that period, he also briefed President George H. W. Bush at the White House, as he had during Operation Desert Storm.

He was also the head of intelligence analysis for the Middle East for seven or eight years at that institution. He was the head of all the Middle East and South Asia analysis in DIA for counter-terrorism for seven years. For his service in the DIA, Lang received the Presidential Rank Award of Distinguished Executive. — Wikipedia